# Dr. Hahn Instructions vs Retinal

The clearest difference is update cadence: Retinal at fortnightly against Dr. Hahn Instructions's every 15 months. Dr. Hahn Instructions's advantage is iOS requirement (11.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Dr. Hahn Instructions ships an update every 15 months, Retinal fortnightly. The most recent releases landed on October 5, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Dr. Hahn Instructions | Retinal |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Fortnightly** |
| Size | 18 MB | 1 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Team Stiefelhagen Werbeagentur GmbH](https://appshunter.io/developer/1031243988) | [Nico Rohrbach](https://appshunter.io/developer/662717596) |

## What reviewers say

### Dr. Hahn Instructions

[App page](https://appshunter.io/ios/app/dr-hahn-instructions/id1147190358)

**Features:** macOS Compatibility

**In-app purchases:** none


### Retinal

[App page](https://appshunter.io/ios/app/retinal/id1564557619)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Dr. Hahn Instructions free?

Dr. Hahn Instructions is free to download, with no in-app purchases.

### Is Retinal free?

Retinal is free to download, with no in-app purchases.

### Do Dr. Hahn Instructions or Retinal have ads?

Neither Dr. Hahn Instructions nor Retinal shows ads.

### Which is updated more often, Dr. Hahn Instructions or Retinal?

Dr. Hahn Instructions ships an update every 15 months, and Retinal fortnightly. Most recently, Dr. Hahn Instructions was updated on October 5, 2026 and Retinal on October 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*